EP 0199912 A2 19861105 - Process for the manufacture of coarse-grained dicalcium phosphate dihydrate.
Title (en)
Process for the manufacture of coarse-grained dicalcium phosphate dihydrate.
Title (de)
Verfahren zur Herstellung von grobkörnigem Dicalciumphosphat-Dihydrat.
Title (fr)
Procédé de fabrication de phosphate dicalcique dihydraté à gros grains.
Publication
Application
Priority
DE 3515695 A 19850502
Abstract (en)
[origin: US4755367A] A process for the preparation of coarse-particle dicalcium phosphate dihydrate having a virtually spherical crystal shape and a particle size range between about 63 and 450 mu m, preferably between about 90 and 300 mu m, by reacting pure aqueous phosphoric acid with aqueous suspensions of precipitated chalks, wherein an amount of suspension corresponding to the reaction product formed is removed continuously or semicontinuously and the dicalcium phosphate dihydrate is separated off, washed and dried. Also disclosed is coarse-particle dicalcium phosphate dihydrate produced by the above process.
Abstract (de)
Die vorliegende Erfindung betrifft ein kontinuierliches Verfahren zur Herstellung von grobkörnigem Dicalciumphosphat-Dihydrat mit nahezu sphärischer Kristallform in einem Korngrößenbereich zwischen 63 und 450 µm, bevorzugt zwischen 90 und 300 µm, durch Reaktion von reiner wäßriger Phosphorsäure mit wäßrigen Suspensionen von Fällkreiden, wobei man kontinuierlich oder semikontinuierlich eine dem gebildeten Reaktionsprodukt entsprechende Menge der Suspension entnimmt und in bekannter Weise das DCP-Dihydrat abtrennt, wäscht und trocknet.
IPC 1-7
IPC 8 full level
C01B 25/32 (2006.01)
CPC (source: EP US)
C01B 25/322 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0199912 A2 19861105; EP 0199912 A3 19871007; EP 0199912 B1 19900131; AT E49950 T1 19900215; DE 3515695 A1 19861106; DE 3515695 C2 19870305; DE 3668608 D1 19900308; US 4755367 A 19880705
DOCDB simple family (application)
EP 86101934 A 19860215; AT 86101934 T 19860215; DE 3515695 A 19850502; DE 3668608 T 19860215; US 85386786 A 19860421